| Teddy's Childcare Ltd | Health & social care | 2023 |
| Teesdale London Ltd | Real estate | 2019 |
| Teet Limited | Information & communication | 2024 |
| Teixeira Refurbishment (Sutton) Ltd | Construction | 2011 |
| Tejas Systems Ltd | Information & communication | 2019 |
| Tekjin Ltd | Information & communication | 2026 |
| Telbridge Motor Company Limited | Wholesale & retail | 2003 |
| Telbridge Properties Limited | Administrative & support | 2016 |
| Telecommantra Limited | Wholesale & retail | 2005 |
| Telecoms U.K. Limited | Other services | 2019 |
| Telekey Properties Limited | Real estate | 1993 |
| Telidevara Ltd | Information & communication | 2023 |
| Telit Consulting Ltd | Information & communication | 2018 |
| Telto Limited | Wholesale & retail | 2017 |
| Temple Music Services Ltd | Information & communication | 2022 |
| Tempracore Heating & Cooling Ltd | Construction | 2026 |
| TEN Diffusions Limited | Professional & scientific | 2016 |
| Tenby Court Residents' Association Limited | Households | 1967 |
| Tend Two Creative Ltd | Information & communication | 2026 |
| Tenten Kitchens & Bathrooms Ltd | Manufacturing | 2024 |
| Teresa Court Freehold Limited | Hospitality | 2006 |
| Terminix Peter COX Limited | Professional & scientific | 1987 |
| TERN2 Solutions Ltd | Professional & scientific | 2016 |
| Terra DI Vita Limited | Wholesale & retail | 2009 |
| Terra Labs Limited | Wholesale & retail | 2025 |
| Terra Rossa International Ltd. | Wholesale & retail | 2009 |
| Terra Rossa Ltd. | Wholesale & retail | 2009 |
| Terragrids Ltd | Professional & scientific | 2026 |
| Terry Livesey Complete Building Services Ltd | Construction | 2013 |
| Teryta Associates Limited | Professional & scientific | 2018 |
| Tesca UK Ltd | Wholesale & retail | 2025 |
| Tesho Construction Ltd | Construction | 2019 |
| Teshoservices Limited | Health & social care | 2014 |
| Tesriders Ltd | Health & social care | 2023 |
| Tete Limited | Manufacturing | 2018 |
| Textilearray Ltd | Wholesale & retail | 2019 |
| TF Fencing & Landscaping Ltd | Administrative & support | 2025 |
| TFA Group Limited | Professional & scientific | 2024 |
| Tfim Holding Limited | Wholesale & retail | 2023 |
| Tfl-Ss Limited | Real estate | 2018 |
| TFL-SS-3 Limited | Real estate | 2020 |
| Tfse Ltd | Administrative & support | 2014 |
| TH Construction LDN Ltd | Construction | 2020 |
| Thaara Property Ltd | Real estate | 2025 |
| Thalia's Crook Ltd | Hospitality | 2018 |
| Thalir Technologies Limited | Information & communication | 2025 |
| Tham UK PVT Limited | Real estate | 2017 |
| Thames Commissioning Group Limited | Construction | 2020 |
| Thames Ditton Property Services Ltd | Construction | 2025 |
| Thames International Enterprise Limited | Administrative & support | 2006 |
| Thames Times Group Limited | Manufacturing | 2017 |
| Thames Trent Global Limited | Information & communication | 2024 |
| Thang LOI Ltd | Other services | 2017 |
| Thanga Bhavan Ltd | Real estate | 2018 |
| Thanh Cong Limited | Other services | 2015 |
| Tharakan Homes Ltd | Real estate | 2022 |
| Tharti Holdings Limited | Financial services | 2022 |
| That's ALL Ltd | Administrative & support | 2022 |
| Thatchers (2017) Ltd | Professional & scientific | 2016 |
| That’S ALL International Ltd | Arts & recreation | 2025 |
| That’S ALL TOO Ltd | Arts & recreation | 2024 |
| THE 87 Press C.I.C. | Information & communication | 2018 |
| THE Abraham Initiatives Ltd | Other services | 2006 |
| THE ACJ Bluebird Group Limited | Administrative & support | 2026 |
| THE AI Learning Network Ltd | Education | 2025 |
| THE Antique Porcelain Company Limited | Other services | 1990 |
| THE Aper Group Ltd | Manufacturing | 2026 |
| THE Association of Business Executives Limited | Extraterritorial | 2020 |
| THE Baby Sleep Medic Ltd | Administrative & support | 2024 |
| THE Barbican Group Ltd | Information & communication | 2025 |
| THE Blackhouse Tattoo Limited | Other services | 2023 |
| THE Blue Mountain Consultancy Limited | Professional & scientific | 2025 |
| THE Body Shop Worldwide Limited | Wholesale & retail | 1992 |
| THE Brand Interface Limited | Professional & scientific | 2016 |
| THE Bridge Educational Consultancy Ltd | Education | 2025 |
| THE Britstatus Company Ltd | Construction | 2021 |
| THE Cafe 6868 Ltd | Hospitality | 2025 |
| THE Capital Club (UK) Limited | Financial services | 2012 |
| THE Care Herb Limited | Wholesale & retail | 2021 |
| THE Carroll Partnership Ltd | Administrative & support | 2011 |
| THE Cedrus Group Limited | Financial services | 2024 |
| THE Charred Chilli Limited | Wholesale & retail | 2025 |
| THE Chinese TUI NA and Reflexology Therapists Association UK | Extraterritorial | 2016 |
| THE Cinematic Penguin Limited | Arts & recreation | 2025 |
| THE City Services Ltd | Information & communication | 2025 |
| THE Civil Service Benevolent Fund | Administrative & support | 2010 |
| THE Clapham Heating Partnership Ltd | Construction | 2024 |
| THE Clark (Kent) Partnership Limited | Professional & scientific | 2019 |
| THE Clive Davis Partnership Limited | Professional & scientific | 2002 |
| THE Clover Shipping Company Limited | Transport & logistics | 2019 |
| THE Colourful Mole Limited | Professional & scientific | 2014 |
| THE Content Type Ltd | Administrative & support | 2016 |
| THE Corporate Meeting and Event Services Ltd | Hospitality | 2024 |
| THE Crescent Management Company (Surrey) Limited | Households | 2007 |
| THE Curado Foundation | Health & social care | 2024 |
| THE D'Souza's Limited | Real estate | 2025 |
| THE Derm Doctor Limited | Health & social care | 2013 |
| THE Disability Policy Centre Limited | Information & communication | 2025 |
| THE DPC Original Limited | Information & communication | 2021 |
| THE Drive (Cheam) Limited | Other services | 2010 |